Reference for Sanhedrin 216:8

(בראשית ו, יד) עשה לך תיבת עצי גופר מאי גופר אמר רב אדא אמרי דבי ר' שילא זו מבליגה ואמרי לה גולמיש

Another meaning: After the seven days during which He gave a foretaste of the future world, that they might know what good they had withheld from themselves. Of every clean beast thou shalt take to thee by sevens, man and wife.<span class="x" onmousemove="('comment',' Ibid. VII, 2. This is the literal translation. ');">¹⁵</span>

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